In response to the growing torrent of unsolicited bulk email, many technical schemes have been proposed and implemented to distinguish spam from legitimate mail and to block delivery of spam while letting legitimate mail through. Although none of the schemes is the "magic bullet" some of them, particularly when used in combination with each other, can help limit the amount of spam that users receive.
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About Dr. John R. Levine
Dr. John R. Levine obtained his PHD in Computer Science from Yale University in 1984. He has authored over 20 books including the best sellers, Internet for Dummies, Fighting Spam for Dummies, and UNIX for Dummies. Dr. Levine has served as expert witness on a variety of computer related topics. Additionally John has written white papers and mini papers on several topics.